To Download: Simply click the link and it will take you directly to the image. Some computers will allow you to right click your mouse and give you the option: "Use Image as Desktop Picture" Otherwise save image to your computer and change the background in your computer settings.

To use on iphone/ipad: the easiest way to go about it is just email the photo to yourself. Then open the email on your phone/ipad and save the photo to your phone. Then set the photo as wallpaper once you save it. :)